<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>17_视口的宽度和高度</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .container {
           width: 50vw;
           height: 50vh;
           background-color: pink;
        }
    </style>
</head>
<body>
    <div class="container"></div>
    
</body>
</html>